|
Post by davy on Apr 10, 2016 17:33:39 GMT
Thought I would start a thread on the subject ,,video guiding,,
We all know that with the usual cameras folk have been using for video astronomy have low integration ,under 10 sec for the samsung and under 20 sec for the ln300 and pd1.
The direction im looking at is the newer cameras,hybrids ,imaging cameras with software control to give longer,, integration (exposure time ) or say the new atik camera,,we know there sensitive to pick up objects in the night sky,but some needing a bit more time to accumulate the info,, Would guiding be a thing to look at with these systems. Whats everyone's thoughts on this..:-)
|
|
|
Post by scopesnc on Apr 10, 2016 23:21:19 GMT
It all depends on what camera one uses and how they use it. If any stacking is involved then yes you need to think about it. Some mounts do so well they can track great for a couple minutes and need no guider just a real good polar alignment. How many stacks how fast can you stack? How long of an exposure / integration are you using. Lots of things need to be thought about on this. For most folks I don't think guiding is a must , but for the more advanced newer cameras it is a useful tool to get the most from them. No real perfect answer to this question. I have a SG4 S-Big guider, a stand alone guider like no other and I don't even use it now. I have it if the need ever comes up for it again. The new Polemaster is a great addition to most mounts for most of our needs now and works well. I have one and use it.
Again I say there is no clear answer to the question. We have so many options and set ups we can go with now days. To say it is a must have would be wrong. A great addition for most of us. Yes.
My 00.2 cents worth .
|
|
|
Post by Rick in NWArk on Apr 11, 2016 3:40:33 GMT
Davy, the primary reason I have not done any stacking (even with Miloslick) is because I have not been able to get reliable polar alignment. So I figured I'd get an autoguiding scope (Orion ST80) and use a guide cam and PH4. I've been working to try to get my polar alignment close enough for guiding. I will add that I really want to do H-alpha viewing too - which requires much longer exposures - so it's not just about stacking. I had high hopes for the Mallincam DSm camera due to its sensitivity, but its interlaced, dual-exposure simply fails without very good alignment or guiding.
This new PoleMaster may help me get close enough for guiding - or even eliminate guiding all together!
|
|
|
Post by Dragon Man on Apr 11, 2016 10:18:33 GMT
It all depends on what camera one uses and how they use it. If any stacking is involved then yes you need to think about it. Some mounts do so well they can track great for a couple minutes and need no guider just a real good polar alignment. How many stacks how fast can you stack? How long of an exposure / integration are you using. Lots of things need to be thought about on this. For most folks I don't think guiding is a must , but for the more advanced newer cameras it is a useful tool to get the most from them. No real perfect answer to this question. I have a SG4 S-Big guider, a stand alone guider like no other and I don't even use it now. I have it if the need ever comes up for it again. The new Polemaster is a great addition to most mounts for most of our needs now and works well. I have one and use it. Again I say there is no clear answer to the question. We have so many options and set ups we can go with now days. To say it is a must have would be wrong. A great addition for most of us. Yes. My 00.2 cents worth . Davy, I agree with everything Jim says. I gave up on guiding when I took up video, but the newer latest range of cameras are being used at longer exposure times and may benefit from Guiding. But that also depends on how good your mount is. If you have a very accurate mount you may not need guiding. It's not something I look forward to ever getting back in to.
|
|
|
Post by davy on Apr 11, 2016 12:19:29 GMT
You hit it on the head ken ,,exactly what I was thinking with longer and longer exposures,, how accurate does your mount have to be,as video capture heads more towards imaging.. :-) good to get us all thinking about these things,
|
|
|
Post by Dragon Man on Apr 11, 2016 12:27:49 GMT
Ummmm . . . how do we 'measure' a mount's accuracy. By the seconds of arc error per minute of time? or minutes of arc error per 20 degree slew? I've never read anything about 'measuring' mount accuracy. There must be some sort of scale out there. Now you've got me interested . . Look out Google, here I come
|
|
|
Post by davy on Apr 11, 2016 13:57:14 GMT
Pec ?
|
|
|
Post by Dragon Man on Apr 11, 2016 15:42:48 GMT
Yeah, Periodic Error Correction might tell how much it's out by reporting the amount of error. I haven't found anything using Google yet
|
|
|
Post by Rick in NWArk on Apr 11, 2016 16:33:40 GMT
I've only seen people promoting graphs versus doing some kind of statistical measurement on the PEC over time.
|
|